10/100/1000 Port Connections
If a port appears to malfunction:
• Verify the status of all ports by checking the LEDs. For more information, see sections about the different
panel features in the chapter
Cisco IE9300 Rugged Series Overview, on page 1
• se the
show interfaces
command to see if the port is error-disabled, disabled, or shut down. Reenable
the port if necessary.
• Verify the cable type. See the chapter
Cables and Connectors, on page 69
.
SFP Module
Use only Cisco SFP modules. Each Cisco module has an internal serial EEPROM that is encoded with security
information. This encoding verifies that the module meets the requirements for the switch.
• Inspect the SFP module. Exchange the suspect module with a known good module.
• Verify that the module is supported on this platform. (The switch release notes on Cisco.com list the SFP
modules that the switch supports.)
• Use the
show interfaces
command to see if the port or module is error-disabled, disabled, or shutdown.
Reenable the port if needed.
• Make sure that all fiber-optic connections are clean and securely connected.
Interface Settings
Verify that the interface is not disabled or powered off. If an interface is manually shut down on either side
of the link, it does not come up until you reenable the interface. Use the
show interfaces
command to see if
the interface is error-disabled, disabled, or shut down on either side of the connection. If needed, reenable the
interface.
Ping End Device
Ping from the directly connected switch first, and then work your way back port by port, interface by interface,
trunk by trunk, until you find the source of the connectivity issue. Make sure that each switch can identify
the end device MAC address in its Content-Addressable Memory (CAM) table.
Spanning Tree Loops
ASpanning Tree Protocol (STP) loops can cause serious performance issues that look like port or interface
problems.
A unidirectional link can cause loops. It occurs when the traffic sent by the switch is received by the neighbor,
but the traffic from the neighbor is not received by the switch. A broken cable, other cabling problems, or a
port issue can cause this one-way communication.
You can enable UniDirectional Link Detection (UDLD) on the switch to help identify unidirectional link
problems. For information about enabling UDLD on the switch, see the “Understanding UDLD” section in
the switch software configuration guide on Cisco.com.
Cisco Catalyst IE9300 Rugged Series Switch Hardware Installation Guide
65
Troubleshooting
10/100/1000 Port Connections
Summary of Contents for Catalyst IE-9310-26S2C-A
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